Has anyone had any luck in using the ExportToFile function? I'm trying to setup a scheduled export of form data but with the code below all I get is an excel file that has the correct headers but no datarows, any thoughts?

var excelProvider = Umbraco.Forms.Core.Providers.ExportTypeProviderCollection.Instance.GetProviderInstance(Guid.Parse(Umbraco.Forms.Core.Constants.ExportTypes.Excel));
        var formFilter = new RecordExportFilter
        {
            StartDate = DateTime.Today.AddDays(-14),
            EndDate = DateTime.Today,
            Form = GuidHelper.GetGuid("ffda27cf-0337-436f-a7de-3f57196531bb"),
        };

        var formLocation = HostingEnvironment.MapPath("~/App_Data/NewsletterExport.xlsx");
        excelProvider.ExportToFile(formFilter, formLocation);

Nik